Former Marine Corps Sgt. Maj. John Estrada is President Obama's pick to be ambassador to Trinidad and Tobago. (Alan Lessig / Staff)

WASHINGTON — President Obama is tapping a major campaign fundraiser and a former Marine who backed his campaign as U.S. ambassadors.

The White House says John Estrada is Obama’s pick for Trinidad and Tobago. Estrada held the top enlisted post in the Marine Corps. He endorsed Obama and spoke at the 2008 Democratic convention.

Obama has selected Noah Mamet for Argentina. As a Democratic operative, he raised more than $500,000 for Obama’s re-election.

Estrada and Mamet join a string of Obama political supporters to be offered ambassadorships recently.

The White House says five veteran diplomats have been picked for other embassies. Obama is nominating Robert Blake for Indonesia, Thomas Daughton for Namibia, Phillip Goldberg for the Philippines, Michael Hoza for Cameroon and Eunice Reddick for Niger.